1/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18#include "soft-interface.h" 19#include "main.h" 20 21#include <linux/atomic.h> 22#include <linux/byteorder/generic.h> 23#include <linux/cache.h> 24#include <linux/compiler.h> 25#include <linux/errno.h> 26#include <linux/etherdevice.h> 27#include <linux/ethtool.h> 28#include <linux/fs.h> 29#include <linux/if_ether.h> 30#include <linux/if_vlan.h> 31#include <linux/jiffies.h> 32#include <linux/kernel.h> 33#include <linux/list.h> 34#include <linux/lockdep.h> 35#include <linux/netdevice.h> 36#include <linux/percpu.h> 37#include <linux/printk.h> 38#include <linux/random.h> 39#include <linux/rculist.h> 40#include <linux/rcupdate.h> 41#include <linux/skbuff.h> 42#include <linux/slab.h> 43#include <linux/socket.h> 44#include <linux/spinlock.h> 45#include <linux/stddef.h> 46#include <linux/string.h> 47#include <linux/types.h> 48#include <linux/workqueue.h> 49 50#include "bridge_loop_avoidance.h" 51#include "debugfs.h" 52#include "distributed-arp-table.h" 53#include "gateway_client.h" 54#include "gateway_common.h" 55#include "hard-interface.h" 56#include "multicast.h" 57#include "network-coding.h" 58#include "packet.h" 59#include "send.h" 60#include "sysfs.h" 61#include "translation-table.h" 62 63static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); 64static void batadv_get_drvinfo(struct net_device *dev, 65 struct ethtool_drvinfo *info); 66static u32 batadv_get_msglevel(struct net_device *dev); 67static void batadv_set_msglevel(struct net_device *dev, u32 value); 68static u32 batadv_get_link(struct net_device *dev); 69static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); 70static void batadv_get_ethtool_stats(struct net_device *dev, 71 struct ethtool_stats *stats, u64 *data); 72static int batadv_get_sset_count(struct net_device *dev, int stringset); 73 74static const struct ethtool_ops batadv_ethtool_ops = { 75 .get_settings = batadv_get_settings, 76 .get_drvinfo = batadv_get_drvinfo, 77 .get_msglevel = batadv_get_msglevel, 78 .set_msglevel = batadv_set_msglevel, 79 .get_link = batadv_get_link, 80 .get_strings = batadv_get_strings, 81 .get_ethtool_stats = batadv_get_ethtool_stats, 82 .get_sset_count = batadv_get_sset_count, 83}; 84 85int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 86{ 87 int result; 88 89 /* TODO: We must check if we can release all references to non-payload 90 * data using skb_header_release in our skbs to allow skb_cow_header to 91 * work optimally. This means that those skbs are not allowed to read 92 * or write any data which is before the current position of skb->data 93 * after that call and thus allow other skbs with the same data buffer 94 * to write freely in that area. 95 */ 96 result = skb_cow_head(skb, len); 97 if (result < 0) 98 return result; 99 100 skb_push(skb, len); 101 return 0; 102} 103 104static int batadv_interface_open(struct net_device *dev) 105{ 106 netif_start_queue(dev); 107 return 0; 108} 109 110static int batadv_interface_release(struct net_device *dev) 111{ 112 netif_stop_queue(dev); 113 return 0; 114} 115 116static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 117{ 118 struct batadv_priv *bat_priv = netdev_priv(dev); 119 struct net_device_stats *stats = &bat_priv->stats; 120 121 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 122 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 123 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 124 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 125 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 126 return stats; 127} 128 129static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 130{ 131 struct batadv_priv *bat_priv = netdev_priv(dev); 132 struct batadv_softif_vlan *vlan; 133 struct sockaddr *addr = p; 134 u8 old_addr[ETH_ALEN]; 135 136 if (!is_valid_ether_addr(addr->sa_data)) 137 return -EADDRNOTAVAIL; 138 139 ether_addr_copy(old_addr, dev->dev_addr); 140 ether_addr_copy(dev->dev_addr, addr->sa_data); 141 142 /* only modify transtable if it has been initialized before */ 143 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 144 return 0; 145 146 rcu_read_lock(); 147 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 148 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 149 "mac address changed", false); 150 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 151 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 152 } 153 rcu_read_unlock(); 154 155 return 0; 156} 157 158static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 159{ 160 /* check ranges */ 161 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) 162 return -EINVAL; 163 164 dev->mtu = new_mtu; 165 166 return 0; 167} 168 169/** 170 * batadv_interface_set_rx_mode - set the rx mode of a device 171 * @dev: registered network device to modify 172 * 173 * We do not actually need to set any rx filters for the virtual batman 174 * soft interface. However a dummy handler enables a user to set static 175 * multicast listeners for instance. 176 */ 177static void batadv_interface_set_rx_mode(struct net_device *dev) 178{ 179} 180 181static int batadv_interface_tx(struct sk_buff *skb, 182 struct net_device *soft_iface) 183{ 184 struct ethhdr *ethhdr; 185 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 186 struct batadv_hard_iface *primary_if = NULL; 187 struct batadv_bcast_packet *bcast_packet; 188 __be16 ethertype = htons(ETH_P_BATMAN); 189 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 190 0x00, 0x00}; 191 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 192 0x00, 0x00}; 193 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 194 u8 *dst_hint = NULL, chaddr[ETH_ALEN]; 195 struct vlan_ethhdr *vhdr; 196 unsigned int header_len = 0; 197 int data_len = skb->len, ret; 198 unsigned long brd_delay = 1; 199 bool do_bcast = false, client_added; 200 unsigned short vid; 201 u32 seqno; 202 int gw_mode; 203 enum batadv_forw_mode forw_mode; 204 struct batadv_orig_node *mcast_single_orig = NULL; 205 int network_offset = ETH_HLEN; 206 207 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 208 goto dropped; 209 210 soft_iface->trans_start = jiffies; 211 vid = batadv_get_vid(skb, 0); 212 ethhdr = eth_hdr(skb); 213 214 switch (ntohs(ethhdr->h_proto)) { 215 case ETH_P_8021Q: 216 vhdr = vlan_eth_hdr(skb); 217 218 if (vhdr->h_vlan_encapsulated_proto != ethertype) { 219 network_offset += VLAN_HLEN; 220 break; 221 } 222 223 /* fall through */ 224 case ETH_P_BATMAN: 225 goto dropped; 226 } 227 228 skb_set_network_header(skb, network_offset); 229 230 if (batadv_bla_tx(bat_priv, skb, vid)) 231 goto dropped; 232 233 /* skb->data might have been reallocated by batadv_bla_tx() */ 234 ethhdr = eth_hdr(skb); 235 236 /* Register the client MAC in the transtable */ 237 if (!is_multicast_ether_addr(ethhdr->h_source)) { 238 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 239 vid, skb->skb_iif, 240 skb->mark); 241 if (!client_added) 242 goto dropped; 243 } 244 245 /* don't accept stp packets. STP does not help in meshes. 246 * better use the bridge loop avoidance ... 247 * 248 * The same goes for ECTP sent at least by some Cisco Switches, 249 * it might confuse the mesh when used with bridge loop avoidance. 250 */ 251 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 252 goto dropped; 253 254 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 255 goto dropped; 256 257 gw_mode = atomic_read(&bat_priv->gw_mode); 258 if (is_multicast_ether_addr(ethhdr->h_dest)) { 259 /* if gw mode is off, broadcast every packet */ 260 if (gw_mode == BATADV_GW_MODE_OFF) { 261 do_bcast = true; 262 goto send; 263 } 264 265 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 266 chaddr); 267 /* skb->data may have been modified by 268 * batadv_gw_dhcp_recipient_get() 269 */ 270 ethhdr = eth_hdr(skb); 271 /* if gw_mode is on, broadcast any non-DHCP message. 272 * All the DHCP packets are going to be sent as unicast 273 */ 274 if (dhcp_rcp == BATADV_DHCP_NO) { 275 do_bcast = true; 276 goto send; 277 } 278 279 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 280 dst_hint = chaddr; 281 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 282 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 283 /* gateways should not forward any DHCP message if 284 * directed to a DHCP server 285 */ 286 goto dropped; 287 288send: 289 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 290 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 291 &mcast_single_orig); 292 if (forw_mode == BATADV_FORW_NONE) 293 goto dropped; 294 295 if (forw_mode == BATADV_FORW_SINGLE) 296 do_bcast = false; 297 } 298 } 299 300 batadv_skb_set_priority(skb, 0); 301 302 /* ethernet packet should be broadcasted */ 303 if (do_bcast) { 304 primary_if = batadv_primary_if_get_selected(bat_priv); 305 if (!primary_if) 306 goto dropped; 307 308 /* in case of ARP request, we do not immediately broadcasti the 309 * packet, instead we first wait for DAT to try to retrieve the 310 * correct ARP entry 311 */ 312 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 313 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 314 315 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 316 goto dropped; 317 318 bcast_packet = (struct batadv_bcast_packet *)skb->data; 319 bcast_packet->version = BATADV_COMPAT_VERSION; 320 bcast_packet->ttl = BATADV_TTL; 321 322 /* batman packet type: broadcast */ 323 bcast_packet->packet_type = BATADV_BCAST; 324 bcast_packet->reserved = 0; 325 326 /* hw address of first interface is the orig mac because only 327 * this mac is known throughout the mesh 328 */ 329 ether_addr_copy(bcast_packet->orig, 330 primary_if->net_dev->dev_addr); 331 332 /* set broadcast sequence number */ 333 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 334 bcast_packet->seqno = htonl(seqno); 335 336 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); 337 338 /* a copy is stored in the bcast list, therefore removing 339 * the original skb. 340 */ 341 kfree_skb(skb); 342 343 /* unicast packet */ 344 } else { 345 /* DHCP packets going to a server will use the GW feature */ 346 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 347 ret = batadv_gw_out_of_range(bat_priv, skb); 348 if (ret) 349 goto dropped; 350 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 351 } else if (mcast_single_orig) { 352 ret = batadv_send_skb_unicast(bat_priv, skb, 353 BATADV_UNICAST, 0, 354 mcast_single_orig, vid); 355 } else { 356 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 357 skb)) 358 goto dropped; 359 360 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 361 362 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 363 vid); 364 } 365 if (ret == NET_XMIT_DROP) 366 goto dropped_freed; 367 } 368 369 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 370 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 371 goto end; 372 373dropped: 374 kfree_skb(skb); 375dropped_freed: 376 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 377end: 378 if (primary_if) 379 batadv_hardif_free_ref(primary_if); 380 return NETDEV_TX_OK; 381} 382 383void batadv_interface_rx(struct net_device *soft_iface, 384 struct sk_buff *skb, struct batadv_hard_iface *recv_if, 385 int hdr_size, struct batadv_orig_node *orig_node) 386{ 387 struct batadv_bcast_packet *batadv_bcast_packet; 388 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 389 __be16 ethertype = htons(ETH_P_BATMAN); 390 struct vlan_ethhdr *vhdr; 391 struct ethhdr *ethhdr; 392 unsigned short vid; 393 bool is_bcast; 394 395 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 396 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 397 398 /* check if enough space is available for pulling, and pull */ 399 if (!pskb_may_pull(skb, hdr_size)) 400 goto dropped; 401 402 skb_pull_rcsum(skb, hdr_size); 403 skb_reset_mac_header(skb); 404 405 /* clean the netfilter state now that the batman-adv header has been 406 * removed 407 */ 408 nf_reset(skb); 409 410 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 411 goto dropped; 412 413 vid = batadv_get_vid(skb, 0); 414 ethhdr = eth_hdr(skb); 415 416 switch (ntohs(ethhdr->h_proto)) { 417 case ETH_P_8021Q: 418 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 419 goto dropped; 420 421 vhdr = (struct vlan_ethhdr *)skb->data; 422 423 if (vhdr->h_vlan_encapsulated_proto != ethertype) 424 break; 425 426 /* fall through */ 427 case ETH_P_BATMAN: 428 goto dropped; 429 } 430 431 /* skb->dev & skb->pkt_type are set here */ 432 skb->protocol = eth_type_trans(skb, soft_iface); 433 434 /* should not be necessary anymore as we use skb_pull_rcsum() 435 * TODO: please verify this and remove this TODO 436 * -- Dec 21st 2009, Simon Wunderlich 437 */ 438 439 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 440 441 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 442 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 443 skb->len + ETH_HLEN); 444 445 soft_iface->last_rx = jiffies; 446 447 /* Let the bridge loop avoidance check the packet. If will 448 * not handle it, we can safely push it up. 449 */ 450 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 451 goto out; 452 453 if (orig_node) 454 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 455 ethhdr->h_source, vid); 456 457 if (is_multicast_ether_addr(ethhdr->h_dest)) { 458 /* set the mark on broadcast packets if AP isolation is ON and 459 * the packet is coming from an "isolated" client 460 */ 461 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 462 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 463 vid)) { 464 /* save bits in skb->mark not covered by the mask and 465 * apply the mark on the rest 466 */ 467 skb->mark &= ~bat_priv->isolation_mark_mask; 468 skb->mark |= bat_priv->isolation_mark; 469 } 470 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 471 ethhdr->h_dest, vid)) { 472 goto dropped; 473 } 474 475 netif_rx(skb); 476 goto out; 477 478dropped: 479 kfree_skb(skb); 480out: 481 return; 482} 483 484/** 485 * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and 486 * possibly free it 487 * @softif_vlan: the vlan object to release 488 */ 489void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) 490{ 491 if (!vlan) 492 return; 493 494 if (atomic_dec_and_test(&vlan->refcount)) { 495 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 496 hlist_del_rcu(&vlan->list); 497 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 498 499 kfree_rcu(vlan, rcu); 500 } 501} 502 503/** 504 * batadv_softif_vlan_get - get the vlan object for a specific vid 505 * @bat_priv: the bat priv with all the soft interface information 506 * @vid: the identifier of the vlan object to retrieve 507 * 508 * Returns the private data of the vlan matching the vid passed as argument or 509 * NULL otherwise. The refcounter of the returned object is incremented by 1. 510 */ 511struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 512 unsigned short vid) 513{ 514 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 515 516 rcu_read_lock(); 517 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 518 if (vlan_tmp->vid != vid) 519 continue; 520 521 if (!atomic_inc_not_zero(&vlan_tmp->refcount)) 522 continue; 523 524 vlan = vlan_tmp; 525 break; 526 } 527 rcu_read_unlock(); 528 529 return vlan; 530} 531 532/** 533 * batadv_create_vlan - allocate the needed resources for a new vlan 534 * @bat_priv: the bat priv with all the soft interface information 535 * @vid: the VLAN identifier 536 * 537 * Returns 0 on success, a negative error otherwise. 538 */ 539int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 540{ 541 struct batadv_softif_vlan *vlan; 542 int err; 543 544 vlan = batadv_softif_vlan_get(bat_priv, vid); 545 if (vlan) { 546 batadv_softif_vlan_free_ref(vlan); 547 return -EEXIST; 548 } 549 550 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 551 if (!vlan) 552 return -ENOMEM; 553 554 vlan->bat_priv = bat_priv; 555 vlan->vid = vid; 556 atomic_set(&vlan->refcount, 1); 557 558 atomic_set(&vlan->ap_isolation, 0); 559 560 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 561 if (err) { 562 kfree(vlan); 563 return err; 564 } 565 566 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 567 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 568 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 569 570 /* add a new TT local entry. This one will be marked with the NOPURGE 571 * flag 572 */ 573 batadv_tt_local_add(bat_priv->soft_iface, 574 bat_priv->soft_iface->dev_addr, vid, 575 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 576 577 return 0; 578} 579 580/** 581 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 582 * @bat_priv: the bat priv with all the soft interface information 583 * @vlan: the object to remove 584 */ 585static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 586 struct batadv_softif_vlan *vlan) 587{ 588 /* explicitly remove the associated TT local entry because it is marked 589 * with the NOPURGE flag 590 */ 591 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 592 vlan->vid, "vlan interface destroyed", false); 593 594 batadv_sysfs_del_vlan(bat_priv, vlan); 595 batadv_softif_vlan_free_ref(vlan); 596} 597 598/** 599 * batadv_interface_add_vid - ndo_add_vid API implementation 600 * @dev: the netdev of the mesh interface 601 * @vid: identifier of the new vlan 602 * 603 * Set up all the internal structures for handling the new vlan on top of the 604 * mesh interface 605 * 606 * Returns 0 on success or a negative error code in case of failure. 607 */ 608static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 609 unsigned short vid) 610{ 611 struct batadv_priv *bat_priv = netdev_priv(dev); 612 struct batadv_softif_vlan *vlan; 613 int ret; 614 615 /* only 802.1Q vlans are supported. 616 * batman-adv does not know how to handle other types 617 */ 618 if (proto != htons(ETH_P_8021Q)) 619 return -EINVAL; 620 621 vid |= BATADV_VLAN_HAS_TAG; 622 623 /* if a new vlan is getting created and it already exists, it means that 624 * it was not deleted yet. batadv_softif_vlan_get() increases the 625 * refcount in order to revive the object. 626 * 627 * if it does not exist then create it. 628 */ 629 vlan = batadv_softif_vlan_get(bat_priv, vid); 630 if (!vlan) 631 return batadv_softif_create_vlan(bat_priv, vid); 632 633 /* recreate the sysfs object if it was already destroyed (and it should 634 * be since we received a kill_vid() for this vlan 635 */ 636 if (!vlan->kobj) { 637 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 638 if (ret) { 639 batadv_softif_vlan_free_ref(vlan); 640 return ret; 641 } 642 } 643 644 /* add a new TT local entry. This one will be marked with the NOPURGE 645 * flag. This must be added again, even if the vlan object already 646 * exists, because the entry was deleted by kill_vid() 647 */ 648 batadv_tt_local_add(bat_priv->soft_iface, 649 bat_priv->soft_iface->dev_addr, vid, 650 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 651 652 return 0; 653} 654 655/** 656 * batadv_interface_kill_vid - ndo_kill_vid API implementation 657 * @dev: the netdev of the mesh interface 658 * @vid: identifier of the deleted vlan 659 * 660 * Destroy all the internal structures used to handle the vlan identified by vid 661 * on top of the mesh interface 662 * 663 * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 664 * or -ENOENT if the specified vlan id wasn't registered. 665 */ 666static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 667 unsigned short vid) 668{ 669 struct batadv_priv *bat_priv = netdev_priv(dev); 670 struct batadv_softif_vlan *vlan; 671 672 /* only 802.1Q vlans are supported. batman-adv does not know how to 673 * handle other types 674 */ 675 if (proto != htons(ETH_P_8021Q)) 676 return -EINVAL; 677 678 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 679 if (!vlan) 680 return -ENOENT; 681 682 batadv_softif_destroy_vlan(bat_priv, vlan); 683 684 /* finally free the vlan object */ 685 batadv_softif_vlan_free_ref(vlan); 686 687 return 0; 688} 689 690/* batman-adv network devices have devices nesting below it and are a special 691 * "super class" of normal network devices; split their locks off into a 692 * separate class since they always nest. 693 */ 694static struct lock_class_key batadv_netdev_xmit_lock_key; 695static struct lock_class_key batadv_netdev_addr_lock_key; 696 697/** 698 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 699 * @dev: device which owns the tx queue 700 * @txq: tx queue to modify 701 * @_unused: always NULL 702 */ 703static void batadv_set_lockdep_class_one(struct net_device *dev, 704 struct netdev_queue *txq, 705 void *_unused) 706{ 707 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 708} 709 710/** 711 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 712 * @dev: network device to modify 713 */ 714static void batadv_set_lockdep_class(struct net_device *dev) 715{ 716 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 717 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 718} 719 720/** 721 * batadv_softif_destroy_finish - cleans up the remains of a softif 722 * @work: work queue item 723 * 724 * Free the parts of the soft interface which can not be removed under 725 * rtnl lock (to prevent deadlock situations). 726 */ 727static void batadv_softif_destroy_finish(struct work_struct *work) 728{ 729 struct batadv_softif_vlan *vlan; 730 struct batadv_priv *bat_priv; 731 struct net_device *soft_iface; 732 733 bat_priv = container_of(work, struct batadv_priv, 734 cleanup_work); 735 soft_iface = bat_priv->soft_iface; 736 737 /* destroy the "untagged" VLAN */ 738 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 739 if (vlan) { 740 batadv_softif_destroy_vlan(bat_priv, vlan); 741 batadv_softif_vlan_free_ref(vlan); 742 } 743 744 batadv_sysfs_del_meshif(soft_iface); 745 unregister_netdev(soft_iface); 746} 747 748/** 749 * batadv_softif_init_late - late stage initialization of soft interface 750 * @dev: registered network device to modify 751 * 752 * Returns error code on failures 753 */ 754static int batadv_softif_init_late(struct net_device *dev) 755{ 756 struct batadv_priv *bat_priv; 757 u32 random_seqno; 758 int ret; 759 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 760 761 batadv_set_lockdep_class(dev); 762 763 bat_priv = netdev_priv(dev); 764 bat_priv->soft_iface = dev; 765 INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); 766 767 /* batadv_interface_stats() needs to be available as soon as 768 * register_netdevice() has been called 769 */ 770 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 771 if (!bat_priv->bat_counters) 772 return -ENOMEM; 773 774 atomic_set(&bat_priv->aggregated_ogms, 1); 775 atomic_set(&bat_priv->bonding, 0); 776#ifdef CONFIG_BATMAN_ADV_BLA 777 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 778#endif 779#ifdef CONFIG_BATMAN_ADV_DAT 780 atomic_set(&bat_priv->distributed_arp_table, 1); 781#endif 782#ifdef CONFIG_BATMAN_ADV_MCAST 783 bat_priv->mcast.flags = BATADV_NO_FLAGS; 784 atomic_set(&bat_priv->multicast_mode, 1); 785 atomic_set(&bat_priv->mcast.num_disabled, 0); 786 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 787 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 788 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 789#endif 790 atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF); 791 atomic_set(&bat_priv->gw_sel_class, 20); 792 atomic_set(&bat_priv->gw.bandwidth_down, 100); 793 atomic_set(&bat_priv->gw.bandwidth_up, 20); 794 atomic_set(&bat_priv->orig_interval, 1000); 795 atomic_set(&bat_priv->hop_penalty, 30); 796#ifdef CONFIG_BATMAN_ADV_DEBUG 797 atomic_set(&bat_priv->log_level, 0); 798#endif 799 atomic_set(&bat_priv->fragmentation, 1); 800 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 801 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 802 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 803 804 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 805 atomic_set(&bat_priv->bcast_seqno, 1); 806 atomic_set(&bat_priv->tt.vn, 0); 807 atomic_set(&bat_priv->tt.local_changes, 0); 808 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 809#ifdef CONFIG_BATMAN_ADV_BLA 810 atomic_set(&bat_priv->bla.num_requests, 0); 811#endif 812 bat_priv->tt.last_changeset = NULL; 813 bat_priv->tt.last_changeset_len = 0; 814 bat_priv->isolation_mark = 0; 815 bat_priv->isolation_mark_mask = 0; 816 817 /* randomize initial seqno to avoid collision */ 818 get_random_bytes(&random_seqno, sizeof(random_seqno)); 819 atomic_set(&bat_priv->frag_seqno, random_seqno); 820 821 bat_priv->primary_if = NULL; 822 bat_priv->num_ifaces = 0; 823 824 batadv_nc_init_bat_priv(bat_priv); 825 826 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 827 if (ret < 0) 828 goto free_bat_counters; 829 830 ret = batadv_debugfs_add_meshif(dev); 831 if (ret < 0) 832 goto free_bat_counters; 833 834 ret = batadv_mesh_init(dev); 835 if (ret < 0) 836 goto unreg_debugfs; 837 838 return 0; 839 840unreg_debugfs: 841 batadv_debugfs_del_meshif(dev); 842free_bat_counters: 843 free_percpu(bat_priv->bat_counters); 844 bat_priv->bat_counters = NULL; 845 846 return ret; 847} 848 849/** 850 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 851 * @dev: batadv_soft_interface used as master interface 852 * @slave_dev: net_device which should become the slave interface 853 * 854 * Return 0 if successful or error otherwise. 855 */ 856static int batadv_softif_slave_add(struct net_device *dev, 857 struct net_device *slave_dev) 858{ 859 struct batadv_hard_iface *hard_iface; 860 int ret = -EINVAL; 861 862 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 863 if (!hard_iface || hard_iface->soft_iface) 864 goto out; 865 866 ret = batadv_hardif_enable_interface(hard_iface, dev->name); 867 868out: 869 if (hard_iface) 870 batadv_hardif_free_ref(hard_iface); 871 return ret; 872} 873 874/** 875 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 876 * @dev: batadv_soft_interface used as master interface 877 * @slave_dev: net_device which should be removed from the master interface 878 * 879 * Return 0 if successful or error otherwise. 880 */ 881static int batadv_softif_slave_del(struct net_device *dev, 882 struct net_device *slave_dev) 883{ 884 struct batadv_hard_iface *hard_iface; 885 int ret = -EINVAL; 886 887 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 888 889 if (!hard_iface || hard_iface->soft_iface != dev) 890 goto out; 891 892 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 893 ret = 0; 894 895out: 896 if (hard_iface) 897 batadv_hardif_free_ref(hard_iface); 898 return ret; 899} 900 901static const struct net_device_ops batadv_netdev_ops = { 902 .ndo_init = batadv_softif_init_late, 903 .ndo_open = batadv_interface_open, 904 .ndo_stop = batadv_interface_release, 905 .ndo_get_stats = batadv_interface_stats, 906 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 907 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 908 .ndo_set_mac_address = batadv_interface_set_mac_addr, 909 .ndo_change_mtu = batadv_interface_change_mtu, 910 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 911 .ndo_start_xmit = batadv_interface_tx, 912 .ndo_validate_addr = eth_validate_addr, 913 .ndo_add_slave = batadv_softif_slave_add, 914 .ndo_del_slave = batadv_softif_slave_del, 915}; 916 917/** 918 * batadv_softif_free - Deconstructor of batadv_soft_interface 919 * @dev: Device to cleanup and remove 920 */ 921static void batadv_softif_free(struct net_device *dev) 922{ 923 batadv_debugfs_del_meshif(dev); 924 batadv_mesh_free(dev); 925 926 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 927 * their tasks. Wait for them all to be finished before freeing the 928 * netdev and its private data (bat_priv) 929 */ 930 rcu_barrier(); 931 932 free_netdev(dev); 933} 934 935/** 936 * batadv_softif_init_early - early stage initialization of soft interface 937 * @dev: registered network device to modify 938 */ 939static void batadv_softif_init_early(struct net_device *dev) 940{ 941 struct batadv_priv *priv = netdev_priv(dev); 942 943 ether_setup(dev); 944 945 dev->netdev_ops = &batadv_netdev_ops; 946 dev->destructor = batadv_softif_free; 947 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 948 dev->priv_flags |= IFF_NO_QUEUE; 949 950 /* can't call min_mtu, because the needed variables 951 * have not been initialized yet 952 */ 953 dev->mtu = ETH_DATA_LEN; 954 955 /* generate random address */ 956 eth_hw_addr_random(dev); 957 958 dev->ethtool_ops = &batadv_ethtool_ops; 959 960 memset(priv, 0, sizeof(*priv)); 961} 962 963struct net_device *batadv_softif_create(const char *name) 964{ 965 struct net_device *soft_iface; 966 int ret; 967 968 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 969 NET_NAME_UNKNOWN, batadv_softif_init_early); 970 if (!soft_iface) 971 return NULL; 972 973 soft_iface->rtnl_link_ops = &batadv_link_ops; 974 975 ret = register_netdevice(soft_iface); 976 if (ret < 0) { 977 pr_err("Unable to register the batman interface '%s': %i\n", 978 name, ret); 979 free_netdev(soft_iface); 980 return NULL; 981 } 982 983 return soft_iface; 984} 985 986/** 987 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 988 * @soft_iface: the to-be-removed batman-adv interface 989 */ 990void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 991{ 992 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 993 994 queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); 995} 996 997/** 998 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 999 * @soft_iface: the to-be-removed batman-adv interface 1000 * @head: list pointer 1001 */ 1002static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1003 struct list_head *head) 1004{ 1005 struct batadv_hard_iface *hard_iface; 1006 1007 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1008 if (hard_iface->soft_iface == soft_iface) 1009 batadv_hardif_disable_interface(hard_iface, 1010 BATADV_IF_CLEANUP_KEEP); 1011 } 1012 1013 batadv_sysfs_del_meshif(soft_iface); 1014 unregister_netdevice_queue(soft_iface, head); 1015} 1016 1017int batadv_softif_is_valid(const struct net_device *net_dev) 1018{ 1019 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1020 return 1; 1021 1022 return 0; 1023} 1024 1025struct rtnl_link_ops batadv_link_ops __read_mostly = { 1026 .kind = "batadv", 1027 .priv_size = sizeof(struct batadv_priv), 1028 .setup = batadv_softif_init_early, 1029 .dellink = batadv_softif_destroy_netlink, 1030}; 1031 1032/* ethtool */ 1033static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1034{ 1035 cmd->supported = 0; 1036 cmd->advertising = 0; 1037 ethtool_cmd_speed_set(cmd, SPEED_10); 1038 cmd->duplex = DUPLEX_FULL; 1039 cmd->port = PORT_TP; 1040 cmd->phy_address = 0; 1041 cmd->transceiver = XCVR_INTERNAL; 1042 cmd->autoneg = AUTONEG_DISABLE; 1043 cmd->maxtxpkt = 0; 1044 cmd->maxrxpkt = 0; 1045 1046 return 0; 1047} 1048 1049static void batadv_get_drvinfo(struct net_device *dev, 1050 struct ethtool_drvinfo *info) 1051{ 1052 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1053 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1054 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1055 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1056} 1057 1058static u32 batadv_get_msglevel(struct net_device *dev) 1059{ 1060 return -EOPNOTSUPP; 1061} 1062 1063static void batadv_set_msglevel(struct net_device *dev, u32 value) 1064{ 1065} 1066 1067static u32 batadv_get_link(struct net_device *dev) 1068{ 1069 return 1; 1070} 1071 1072/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1073 * Declare each description string in struct.name[] to get fixed sized buffer 1074 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1075 */ 1076static const struct { 1077 const char name[ETH_GSTRING_LEN]; 1078} batadv_counters_strings[] = { 1079 { "tx" }, 1080 { "tx_bytes" }, 1081 { "tx_dropped" }, 1082 { "rx" }, 1083 { "rx_bytes" }, 1084 { "forward" }, 1085 { "forward_bytes" }, 1086 { "mgmt_tx" }, 1087 { "mgmt_tx_bytes" }, 1088 { "mgmt_rx" }, 1089 { "mgmt_rx_bytes" }, 1090 { "frag_tx" }, 1091 { "frag_tx_bytes" }, 1092 { "frag_rx" }, 1093 { "frag_rx_bytes" }, 1094 { "frag_fwd" }, 1095 { "frag_fwd_bytes" }, 1096 { "tt_request_tx" }, 1097 { "tt_request_rx" }, 1098 { "tt_response_tx" }, 1099 { "tt_response_rx" }, 1100 { "tt_roam_adv_tx" }, 1101 { "tt_roam_adv_rx" }, 1102#ifdef CONFIG_BATMAN_ADV_DAT 1103 { "dat_get_tx" }, 1104 { "dat_get_rx" }, 1105 { "dat_put_tx" }, 1106 { "dat_put_rx" }, 1107 { "dat_cached_reply_tx" }, 1108#endif 1109#ifdef CONFIG_BATMAN_ADV_NC 1110 { "nc_code" }, 1111 { "nc_code_bytes" }, 1112 { "nc_recode" }, 1113 { "nc_recode_bytes" }, 1114 { "nc_buffer" }, 1115 { "nc_decode" }, 1116 { "nc_decode_bytes" }, 1117 { "nc_decode_failed" }, 1118 { "nc_sniffed" }, 1119#endif 1120}; 1121 1122static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1123{ 1124 if (stringset == ETH_SS_STATS) 1125 memcpy(data, batadv_counters_strings, 1126 sizeof(batadv_counters_strings)); 1127} 1128 1129static void batadv_get_ethtool_stats(struct net_device *dev, 1130 struct ethtool_stats *stats, u64 *data) 1131{ 1132 struct batadv_priv *bat_priv = netdev_priv(dev); 1133 int i; 1134 1135 for (i = 0; i < BATADV_CNT_NUM; i++) 1136 data[i] = batadv_sum_counter(bat_priv, i); 1137} 1138 1139static int batadv_get_sset_count(struct net_device *dev, int stringset) 1140{ 1141 if (stringset == ETH_SS_STATS) 1142 return BATADV_CNT_NUM; 1143 1144 return -EOPNOTSUPP; 1145} 1146